頭部外傷による頭鳴に就ての臨床的観察

抄録

Clinical examination for head noises was conducted in 1701 cases of head trauma, and the findings were studied in relation to tinnitus produced by the same cause. The result of this study is as follows:
1) Head noises were defined as a case in which the sound sensation is felt to be located intracranially, but not in the auditory system. These cases fox our study were chosen by questioning.
2) Head noises were found in 138 of these cases. Those of pure head noises numbered 31, which corresponded to 2.13% of the entire cases, and so were very rare. Most of these cases of head noises were combined with tinnitus, numbering 107.
3) In the rate of continuous type to intermittent type there was not much difference between head noises and tinnitus.
4) The cases of disappearance of head noises were very rare, being only 2.13% and those of tinnitus were 12.85%.
5) The most frequent sound of both head noises and tinnitus was sound-Ji, and this sound was more frequently found in tinnitus.
5) Rhythmic sound was found in more cases of head noises than in the cases of tinnitus. About two thirds of the whole cases of head noises bore a resembrance to those of tinnitus in their nature of sound.
7) The percentage of the frequcency matched to head noises or tinnitus existing in the high frequency range was found greater in the cases of head noises than in those of tinnitus.
8) As one of the causes of head noises, intracranial circulatory disturbance was presumed.